Safety device for elevators.



SAFETY DEVICE FOR ELEVATORS. APPLICATION FILED MAR.27.1906.

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No. 838,213. PATENTED DEC. 11, 1906.

' I. B. BITTER.

SAPETY DEVIGE FOR ELEVATORS.

' APPLICATION FILED MAR. 27.1906.

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I. B. BITTER.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION FILED 111511.27, 1906.

PATENTED DEG. I1, 1906.

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[/VVENTOR WfT/VESSES: mm W Isaac l5, Bitter MjLwW 9mm 7m- ISAAC B. BITTER, OF PHILADELPHIA, PENNSYLVANIA.

SAFETY DEVICE FOR ELEVATORS.

Specification of Letters Patent.

Patented Dec. 11, 1906.

Application filed March 27,1906. Serial No. 308,215.

To (all whmn it may concern."

Be it known that I, lsAAc B. Rirrnn, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Safety Devices for Elevators, of which the following is a specification.

My invention relates to safety devices for elevators, and particularly to a safety device for locking the door of the hatchway and means upon the car for unlocking said door when the car is stopped at the floor-level, and also means for locking the starting mechanism of the car when the said door is open.

The object of my invention is to make further improvements in the construction and arrangements of the parts of a safety device for elevators which was disclosed in Letters Patent No. 809,076, granted to me on the 2d day of January, 1906.

Referring to the accompanying drawings, Figure 1 represents a horizontal sectional View taken on a line immediately below the floor of the elevator-car, showing the mechanism carried by the car and also showing a portion of the hatchway. Fig. 2 is a vertical sectional view as on line 2 2, Fig. 1, showing the car opposite the hatchway-door. Fig. 3 is a transverse sectional view as on line 3 3, Fig. 2, showing the car below the door of the hatchway. Fig. 4 is a view similar to Fig. 3, showing the car locked at the hatchwaydoor and the said door released. Fig. 5 is a vertical sectional view as on line 5 5, Fig. 2. Fig. 6 is a detached view of the cam-shoe and sliding frame for carrying the same. Fig. 7 is an end view of Fig. 6. S is a detached view of the cam-plate and frame carrying the same. Fig. 9 is an end view of Fig. 8. Fig. 10 is a vertical sectional View as on line 10 10, Fig. 8. Fig. 11 is an end view of the locking-arm detached. Fig. 12 is a side view ofFig. 11. Fig. 13 is a face view of the projecting block drawn on a larger scale. Fig. 14 is a sectional view as on line 14 14, Fig. 13. Fig. 15 is a rear view of Fig; 13.

Throughout the drawings, 1 represents an elevator-shaft, and 2 the floor-line. A door 3 is shown above the floor-line 2, hinged so as to swing outwardly from the elevator-shaft. The door 3 is provided with a latch 4, which l l l engages a projection 5 on the wall of the elevator-shaft and locks the door. The latch 4 is pivoted at 6 to the door and is provided with an arm 7, which is connected by a link 8 to an arm 9, projecting from a block 10, pivoted at 11 to the door. This form oflatch may be applied to a sliding door, as well as a swinging door.

The block 10 when the door is locked engages the pivoted arm 12 and holds the projecting block 13 on the lowerportion of the said pivoted arm 12 in such a position that the mechanism on the car when in its normal position will not contact with it. The said block 10 is engaged by a bell-crank lever 14, which prevents the said block 10 from moving, and thereby prevents the door from being unlatched. The pivoted arm 12 and the bell-crank lever 14 are pivotally attached to a plate 15, which is secured to the wall of the elevator-shaft.

The bell-crank lever 14 has an arm carrying a projecting block 16, which is acted on by a cam-shoe carried by the mechanism on the car, which forces the bell-crank lever 14 into the position shown in Fig. 4, which releases the block 10, so that the door may be 0 ened.

l/Vhen the door is unlatched and the block 10 is in the position shown in Fig. 4, the pivoted arm 12 will be released and drawn into the position shown in Fig. 4 by the action of springs 17. The projecting block 13 will then engage a cam-plate forming part of the mechanism carried by' the car, more fully hereinafter described. Said cam-plate when so engaged by the block 13 will lock the starting mechanism of the car, so that the latter cannot be started until the door is again closed and the lever 12 forced against the action of the springs 17 into the position shown 'in Fig. 3.

Secured upon the car is a depending frame 18, which forms bearings for the sliding frames 20 and 48, shown detached in Figs. 6 and 8.

The sliding frame 20 consists of the rods 21 and 22, which are made hollow for the purpose of lightening the sliding frame, a crosspiece 23, and acam-shoe 24, above mentioned. Said cam-shoe is provided with clamps 25, by which it is adjustably secured to the rods 21 and 22. A cam-roller 26 is mounted on the said cam-shoe and is acted upon by the cam 27 on the disk 28, mounted on a rockshaft 29, secured in bearings 30 and 31 on the depending frame 18. The rods pass through bushings 32, Fig. 2, in the depending frame 18, so that said sliding frames will move easily and with less noise.

The rock-shaft 29 is operated by the con trolling-lever 33 on the shaft 34, mounted in bearings 35, secured to the car. Said rockshaft 29 has an arm 37, which is connected to the end of an arm 38, secured on the shaft 34 by a link 39. The end of the shaft 34 carries rollers around which the controlling-cables 40 pass in the usual manner.

When the car is running, the parts will be in the position shown in Figs 1, 2, 3, and 5 and the cam-shoe 24 will clear the projecting block 16 as the car passes the floor. The cam-plate 45 will also clear the projecting block 13 when the latter is held out of action by the door being closed.

' When the controlling-lever 33 is brought to a vertical position to stop the car at the floor-line, the parts will be shifted to the position shown in Fig. 4. The disk 28 on the rock-shaft 29 will be rotated, so that the cam 27 will act on the cam-roller 26 and move the sliding frame 20 into the position shown in Fig. 4. The cam-shoe 24 will then strike the projecting block 16 and move the bell-crank lever 14, so as to release the block 10, which may then be moved by raising the latch 4, and thus release the door.

The cross-piece 23 of the sliding frame 20 is provided with an antifriction-roller 41, against which acts one arm of a bell-crank lever 42, pivoted at 43 to the frame 18. The opposite arm 44 of said bell-crank lever is provided with a weigh-ted end, which tends to hoiid the sliding frame 20 in the position shown in 1g. 3.

When the latch 4 has been raised and the block 10 has been I drawn to the position shown in Fig. 4, the pivoted arm 12 will be acted on by the springs 17 and the projecting block 13, carried by the lower end of said arm 12,will take against the cam-plate 45, mounted on hollow rods 46 and 47, as shown in Figs. 8, 9, and 10, which form the sliding frame 48, mounted in the depending frame 18. 'The rods 46 and 47 are connected by a cross-piece 49, carrying an antifriction-roller 50, which is acted on by a bell-crank lever 51, pivoted to the frame 18, having one arm weighted, which tends to hold the sliding frame 45 in the position shown in Figs. 3 and 5,- the springs 17 being of suflicient strength to move the cam-plate 45 and the sliding frame 48 against the action of the bell-crank lever.

Mounted upon the sliding frame 48 is a locking-plate 52, having a recess 53 formed therein, so that when the sliding frame 48 is moved into the position shown in Fig. 4 said locking-plate 52 will fit over the end of a locking-arm 54, secured on the rock-shaft 29, Figs. 1, 11, and 12, and lock the said rock- .shaft. As the rock-shaft 29 is connected to the shaft 34 by the arms 37 and 38 and the link 39 the rock-shaft 34 will also be locked, so that the controlling-lever 33 cannot be vmoved to start the car.

The locking-plate 52, as shown 1n Figs. 8,

9, and 10, is curved and provided with beveled edges 55to more readily guide the locking-arm 54 into the recess formed in sald plate 52 when the locking-plate is moved before the locking-arm has been brought to a position to enter the said recess. The boss on the end of the locking-arm 54 is made in steps which present surfaces parallel with the surfaces of the 'recess formed in the lockingplate 52, which is also formed in steps similar to those on the-boss on the locking-arm 54. By constructing the locking-arm and the locking-plate in this manner it is impossible to force them apart by any action of the operating-lever 33. 1

The cam-shoe 24 and the cam-plate 45 are made with apertures formed therein, so that in case the cam-shoe or the cam-plate accidentally catch they will break and save the balance of the mechanism from being destroyed.

When the door 3 is again closed and the block 10 brought into the position shown in Fig. 3 by-latching the door, the pivoted arm 12 will be forced back andrthe projecting block 13 will be drawn away from the camplate 45, and the sliding frame 48, carrying said cam-plate, will be moved into its normal position by the action of the weighted bellcrank lever 51. When the sliding frame 48 is in the normal position, the locking-plate 52 will be drawn out of engagement with the locking-arm 54 on the rock-shaft 29, which will release the controlling-lever, so that the car may be started.

When the controlling-lever is moved to start the car, the rock-shaft 29 will be moved, and the cam 27 on the disk 28, carried by said rock-sh aft 29, will be withdrawn from engagement with the roller 26 and allow the weighted bell-crank lever 44 to move the sliding frame 20 into its normal position, thereby moving the cam-shoe 24 out of engagement .with the projecting block 16, carried by the bell-crank lever 14. Said bell-crank lever 14 will then be drawn into the position shown in Fig. 3 by the action of the springs 17, and the upper arm of said bell-crank lever 14 will engage IIO IIS

of hard fiber and are made adjustable, as shown in Figs. 13, 14, and 15. The lower end of the pivoted arm 12 and the lower end of the bell-crank lever 14 are each provided with a boss 60, with a channel formed therein to receive the projecting block 13 or 16. The rear side of said boss has a recess formed therein to receive a sliding nut 61, which is secured to the projecting block by screws 62, which pass through an elongated opening 63, formed in the boss 60, to permit the projecting block to be properly adjusted and then secured in the boss 60 by tightening the screws 62. By making the projecting blocks of fiber there will be less noise when the cam-plate and cam-shoe take against said projecting blocks.

Having thus described my invention, 1 claim and desire to secure by Letters Patent 1. The combination of a door, a block on the said door, a bell-cranl lever upon the hatchway for engaging sail block, mechan ism upon the car for operating said bellcrank lever, and means for withdrawing said block when the door is unlatched, substantially as described.

2. The combination of a door, a block pivoted to the same, a latch, levers connecting said latch and said block, means upon the hatchway for engaging said block and to 00- act with the operating mechanism on the car, substantially as described.

3. The combination of a door, a block pivoted to said door, a latch pivoted to said door, arms projecting from said latch and from said block, a link connecting said arms,

,means upon the hatchway to engage sail block and prevent said door from being unlocked, and operating mechanism carried by the car to coact with the said means upon the hatchway to release said block, substantially as described.

4. The combination of a door, a block on said door, a pivoted arm secured to the hatchway, a car, a cam-plate, a sliding frame carrying said cam-plate, a bearing on the car in which said sliding frame is mounted, a locking-plate on said sliding frame, a lockingi arm connected with the controlling-lever of the car, a bell-crank lever having a weighted arm and an arm engaging said sliding frame, substantially as described.

5. The combination of a door, a block on said door, a pivoted arm secured on the hatchway, a car, a depending frame on said car, rods mounted in said depending frame, a cross-piece extending between said rods, a cam-plate on said rods, a locking-plate on said rods, and a locking-arm connected with the controlling-lever of the car, substantially as described.

6. The combination of a car,-a depending frame on said car, a sliding frame, a cam-' plate, a locking-plate having a recess formed therein with the surface thereof formed in steps, a locking-arm, a boss on said arm having steps corresponding in form to the recess formed in said locking-plate, a rock-shaft carrying said locking-arm, means for connecting said rock-shaft with the mechanism for controlling the car, and means upon the hatchway to act upon said cam-plate, substantially as described.

7. The combination said door, a bell-crank hatchway, a cam-shoe, a sliding frame carrying said cam-shoe, a depending frame carried by the car, a bell-crank lever pivoted to said depending frame, a weighted arm on said bell-crank lever and an arm engaging said sliding frame, substantially as described.

8. The combination of a door, a block on said door, a bell-crank lever, a cam-shoe, rods carrying said cam-shoe, a roller on said cam-shoe a depending frame in which said rods are mounted, a cross-piece between said rods, a rock-shaft, a cam on said rock-shaft to act on said roller, and means for connecting said rock-sh. ft with the mechanism for controlling the car, substantially as described.

9. The combination of a car, a depending frame, a sliding frame carrying a cam-plate, a sliding frame carrying a cam-shoe, independent means to act on each of said sliding frames tending to hold them in their normal position, a rock-shaft, a cam on said roclnsha'ft, connections between said rockshaft and the mechanism for controlling the car and projections pivotally connected to the elevator-shaft to coact with said camshoe and said cam-plate, substantially as described.

10. The combination of a car, a depending frame a sliding frame carrying a cam-plate, a sliding frame carrying a cam-shoe, said camshoe and said cam-plate having apertures formed therein, a rock-shaft, a cam thereon, mechanism to control the car connected to said rock-shaft, and projections upon the elevator-shaft to coact with said cam-shoe and said cam-plate, substantially as described.

11. The combination of a car, a depending frame forming bearings, sliding frames mounted in said bearings, said sliding frames having hollow rods, a rock-shaft, mechanism for controlling the car connected to said rock-shaft, and means upon the elevatorshaft to coact with said sliding frames, sub stantially as described.

12. The combination of a car, a depending frame forming bearings, sliding frames mounted in said bearings, bushings in said bearings, through which rods forming part of said sliding frame pass, a rock-shaft, mechanism for controlling the car connected to said of a door, a block on lever secured to the TIO ' levers to receive one of said projecting blocks,

rock-shaft and means u on the elevator- J opening formed therein through Which said I shaft to coact with said siding frames, subscrew may pass and an elongated recess to stantially as described. receive said nut, substantially as described.

13. The combination of a door, a block on 5 In testimony whereof I aflix my signature said door, levers Ipivoted to the hatchway to l in presence of two Witnesses. engage said bloc i, projecting blocks carried I ISAAC B. BITTER.

Witnesses:

JAMES F. BoYLAN,

M. R. OLULAND.

y said levers, a boss formed on each of said a nut, screws, said boss having an elongated 

